On 21 Aug 2014, at 01:03, LizR wrote:
On 21 August 2014 03:13, Bruno Marchal <[email protected]> wrote:
On 18 Aug 2014, at 19:31, meekerdb wrote:
On 8/18/2014 1:35 AM, LizR wrote:
Yes, I still haven't had a satisfactory answer on what that would
mean for a computation - i.e. what physically differentiates
identical computations with different counterfactual add-ons that
don't actually get used.
It's confusing because comp assumes computation is done by
classical physics, but real physics is QM.
Comp assumes classical arithmetic, with classical in the usual
boolean/platonist sense. But QM assumes it too, and comp assumes no
more (except for the act of faith "yes doctor", at the meta-level).
Surely comp assumes, to start with, that consciousness arises from a
classical computation in the brain?
It has to arise from a computation (which is a classical notion: even
a quantum computation is a classical notion).
This is where Brent's objections come in, if it isn't a classical
computation but a quantum one, then comp fails at step 0 - unless a
QC can be emulated by a CC, of course. Which I think maybe it can?
Yes, it can. QM does not violate Church thesis. You can simulate a QC
with CC, and the UD does that infinitely many times. The CC simulation
is slowed down, but the UD itself slows every computations, and that
does not matter for the internal 1p points of view, from which physics
has to be extracted if we want test the solution of the mind-body
problem offered by comp + the classical theory of knowledge).
Bruno
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